// Warn if overriding existing method
if(Array.prototype.equals)
  console.warn("Overriding existing Array.prototype.equals. Possible causes: New API defines the method, there's a framework conflict or you've got double inclusions in your code.");
// attach the .equals method to Array's prototype to call it on any array
Array.prototype.equals = function (array) {
  // if the other array is a falsy value, return
  if (!array)
    return false;
  // compare lengths - can save a lot of time 
  if (this.length != array.length)
    return false;
  for (var i = 0, l = this.length; i < l; i++) {
    // Check if we have nested arrays
    if (this[i] instanceof Array && array[i] instanceof Array) {
      // recurse into the nested arrays
      if (!this[i].equals(array[i]))
        return false;    
    }      
    else if (this[i] != array[i]) { 
      // Warning - two different object instances will never be equal: {x:20} != {x:20}
      return false;  
    }      
  }    
  return true;
}
// Hide method from for-in loops
Object.defineProperty(Array.prototype, "equals", {enumerable: false});
